INSPECTION




PISTON RINGS



1.Check clearance between piston rings and ring grooves. If the limit is exceeded, replace piston rings or piston, or both.
Standard value:
    No. 1 ring: 0.03 - 0.07 mm
    No. 2 ring: 0.03 - 0.07 mm
Limit: 0.1 mm

2.Put piston rings into the cylinder bore, press them against the piston top face, and push them in. After achieving squareness, measure the end gap with a thickness gauge. If the end gap is excessive, replace piston rings.
Standard value:
    No. 1 ring: 0.15 - 0.25 mm
    No. 2 ring: 0.27 - 0.42 mm
    Oil ring: 0.10 - 0.35 mm
Limit:
    No. 1 ring: 0.8 mm
    No. 2 ring: 0.8 mm
    Oil ring: 1.0 mm

CRANKSHAFT PIN OIL CLEARANCE (PLASTIGAGE METHOD)


1.Wipe oil off the crankshaft pin and connecting rod bearing.
2.Place a Plastigage in length equal to the bearing width on the pin shaft straight in alignment with the shaft centre.

3.Carefully install the connecting rod cap.
4.Apply engine oil to the threaded portion and seat surface of the bolt before installing it.
5.After installing each bolt and tightening it by fingers, tighten bolts alternately to properly assemble the cap.
6.Tighten the bolt in several steps until the torque reaches 5.0 N·m.
7.Tighten the bolt in several steps until the torque reaches 20 N·m.

8.Put a paint mark on the bolt head as illustrated.
9.Put a paint mark on the connecting rod at 90° position in the tightening direction of the bolt with reference to the paint mark position of the bolt.
10.
caution
  • When the tightening angle is smaller than the specified tightening angle, the appropriate tightening capacity cannot be secured.
  • When the tightening angle is larger than the specified tightening angle, remove the bolt to start from the beginning again according to the procedure.
Tighten the bolt 90°, and make sure that the paint mark of the connecting rod is aligned with that of the bolt.
11.Remove bolts and gently remove the connecting rod cap.

12.Measure the crushed Plastigage width (area most widely crushed) using a scale printed on the Plastigage bag.
Standard value: 0.018 - 0.045 mm
Limit: 0.1 mm